Missouri Defamation Laws: Libel & Slander (2026)

In Missouri, defamation is a civil claim with a two-year filing deadline under RSMo 516.140, and the state stands out because plaintiffs must prove actual damages in every case. The Missouri Supreme Court abolished the old per se damages shortcut in Nazeri v. Missouri Valley College, 860 S.W.2d 303 (Mo. banc 1993).

This guide is part of our Defamation Laws by State series. For the basics of the claim itself, see what defamation of character means.

What counts as defamation in Missouri?

Defamation in Missouri is a false statement of fact, published to a third party, that injures the plaintiff's reputation. Missouri courts have generally required six elements: publication of a statement, a defamatory meaning, identification of the plaintiff, falsity, the requisite degree of fault, and damage to the plaintiff's reputation. The damages element is what sets Missouri apart, because the Missouri Supreme Court in Nazeri v. Missouri Valley College held that a plaintiff must prove actual damages in all defamation cases, eliminating the older rule that presumed damages for certain categories of statements. Truth is a complete defense, and statements of pure opinion that cannot be proven true or false are protected speech. The statement must be one a reasonable person would understand as asserting a fact about the plaintiff, not loose rhetoric or name-calling. Because Missouri demands proof of actual reputational harm from the start, gathering evidence of concrete injury is central to building any claim.

Libel vs slander in Missouri

Missouri recognizes both libel and slander, and RSMo 516.140 lists both under the same two-year limitations period. Libel is defamation fixed in a permanent form, such as a newspaper article, an email, a social media post, or a broadcast script. Slander is spoken defamation that exists only in the moment it is uttered. Historically the distinction mattered because slander often required proof of special damages while libel did not, but Missouri's Nazeri decision largely flattened that difference for damages purposes by requiring proof of actual damages regardless of which form the defamation took. The form still matters for practical reasons, including how the publication element is proven and which limitations and evidence questions arise. Internet defamation, including a defamatory online review or a false social media post, is treated as libel in Missouri because the statement is recorded in a fixed, lasting form.

Defamation per se in Missouri

Defamation per se still has meaning in Missouri, but not the meaning it has in most states. Traditionally, statements imputing a crime, a loathsome disease, unchastity, or unfitness for one's business or profession were defamatory per se, and damages were presumed. In Nazeri v. Missouri Valley College, the Missouri Supreme Court abolished the distinction between defamation per se and per quod for damages purposes, holding that plaintiffs need not concern themselves with whether the defamation was per se or per quod and must prove actual damages in all cases. Missouri courts still analyze whether a statement is defamatory on its face to decide whether it carries a defamatory meaning, but that analysis no longer lets a plaintiff skip proof of harm. This is the single most important quirk of Missouri defamation law, because a plaintiff who relies on the old presumed-damages theory and offers no proof of actual reputational injury can lose even where the statement is plainly defamatory.

Watch out: Do not assume Missouri presumes damages for serious accusations. After Nazeri, you must prove actual harm to your reputation in every defamation case, even where the statement accuses you of a crime.

The statute of limitations to sue for defamation in Missouri

The statute of limitations for defamation in Missouri is two years, set by RSMo 516.140, which expressly covers actions for libel, slander, and injurious falsehood. This is longer than the one-year window in many neighboring states, but it is still shorter than the general five-year period for many other Missouri civil claims, so defamation plaintiffs should not wait. For libel, the clock generally starts at publication. For slander, Missouri courts have recognized that the limitations period can begin when damages become ascertainable rather than at the moment the words are spoken, a nuance that reflects the actual-damages focus of Missouri law. Missouri follows the single-publication rule, so a single edition, broadcast, or online posting generally gives rise to one cause of action that accrues at first publication and is not restarted each time the material is viewed. Identifying the correct accrual date early helps avoid a fatal timing problem.

Missouri's anti-SLAPP law

Missouri's anti-SLAPP protection changed on August 28, 2026. On that date RSMo 537.528, the narrow statute that had governed since 2004, was repealed, and RSMo 537.529, Missouri's enactment of the Uniform Public Expression Protection Act, took its place (L. 2026 S.B. 835 & 1111, merged with S.B. 1067). By its own terms, section 537.529 applies to any civil action filed, or any cause of action asserted in a civil action, on or after August 28, 2026.

A SLAPP is a meritless lawsuit filed to punish or chill protected speech, and an anti-SLAPP statute lets a defendant move to dismiss such a suit quickly and recover fees. Under the repealed section 537.528, that special motion reached only conduct or speech made in connection with a public hearing or public meeting in a quasi-judicial proceeding before a governmental tribunal or decision-making body, such as a city council, planning commission, or review board. Most ordinary online or media defamation suits fell outside it.

Section 537.529 is considerably broader. It applies to a cause of action asserted in a civil action against a person based on that person's communication in a legislative, executive, judicial, administrative, or other governmental proceeding; communication on an issue under consideration or review in such a proceeding; or exercise of the right of freedom of speech or of the press, the right to assemble or petition, or the right of association, guaranteed by the United States or Missouri Constitution, on a matter of public concern. That last category is the broad one, and the public-concern qualifier is its main boundary. The section excludes claims against a governmental unit, claims brought by a governmental unit to enforce laws protecting public safety, and claims against a person primarily engaged in selling or leasing goods or services that arise from communications related to that sale or lease.

The procedure is time-boxed. A party moves to dismiss within 60 days after service, or later for good cause. The court must hear the motion within 60 days after filing and rule within 60 days after the hearing. Filing the motion automatically stays proceedings until the court rules and the time to appeal expires, although the court may allow limited discovery on a showing that it is necessary. The court dismisses with prejudice if the moving party establishes that the section applies and the responding party neither establishes an exception nor makes out a prima facie case for each essential element of the claim. A party whose motion is denied may appeal as a matter of right within 21 days. Fees and costs go to a prevailing movant; a responding party recovers them only where the motion was frivolous or filed solely to cause delay.

The practical effect is that since August 28, 2026 a defamation suit over speech on a matter of public concern, including an online post or a media report, can face an early special motion to dismiss backed by a discovery stay and fee shifting, which was not the case under the repealed statute. Speech in a purely private dispute that touches no matter of public concern and no governmental proceeding still falls outside the statute.

Public figures and actual malice

The plaintiff's status as a public or private figure sets the fault standard, and this is federal constitutional law that applies identically in Missouri. Under New York Times Co. v. Sullivan, 376 U.S. 254 (1964), a public official suing over statements about official conduct must prove actual malice, meaning the defendant knew the statement was false or acted with reckless disregard for its truth. Gertz v. Robert Welch, Inc., 418 U.S. 323 (1974), applied the actual-malice requirement to public figures, those with pervasive fame or who voluntarily entered a public controversy. Private plaintiffs are treated more favorably. Missouri courts generally require a private plaintiff to prove that the defendant was at least negligent about the truth of the statement, a lower bar than actual malice. Because the fault standard can decide the case, the threshold question of whether the plaintiff is a public or private figure is frequently litigated in Missouri defamation actions.

Damages you can recover in Missouri

Damages in Missouri defamation cases are unusual because actual damages must be proven in every case after Nazeri. Special damages are specific, provable economic losses, such as lost wages, lost clients, or lost contracts. Actual or general damages compensate for proven harm to reputation and resulting emotional distress, but they cannot be presumed; the plaintiff must come forward with evidence of real reputational injury, and Missouri courts have indicated that emotional distress alone, without reputational harm, is not enough. Punitive damages may be available where the plaintiff proves the defendant acted with actual malice, but Missouri caps punitive awards under RSMo 510.265 at the greater of 500,000 dollars or five times the net judgment. Courts have generally held that the plaintiff must tie the claimed losses to the defamatory statement. Because every category here requires proof of actual harm, the strength of a Missouri claim depends heavily on documentary and testimonial evidence of damage.

How to sue for defamation in Missouri

Pursuing a defamation claim in Missouri generally follows a sequence, though every case differs and this is general information rather than legal advice. A common first step is a cease-and-desist or retraction demand letter that identifies the false statement, explains why it is false, and requests removal or correction. Because Missouri requires proof of actual damages, preserving evidence is especially important: save the statement itself, the publication date, the URLs, screenshots, the identities of people who saw or heard it, and any documentation of lost income, lost business, or other concrete harm. The plaintiff then files a civil petition in the circuit court for the county where the statement was first published (RSMo 508.010.8), within the two-year deadline in RSMo 516.140, naming the speaker or publisher and stating the false statements, the resulting harm, and the basis for jurisdiction. Given the actual-damages requirement and the anti-SLAPP change taking effect August 28, 2026, many plaintiffs consult a licensed Missouri attorney early to assess both the proof of harm and the deadline.

How to Sue for Defamation of Character in Missouri

To sue for defamation of character in Missouri, a plaintiff generally must file within two years under RSMo 516.140, which sets a two-year limit for actions for libel and slander. Venue is fixed by statute rather than left to the plaintiff's choice: RSMo 508.010.4 requires that a tort suit be filed in the county where the plaintiff was first injured, and RSMo 508.010.8 provides that in a defamation action the plaintiff is considered first injured in the county where the defamation was first published. The defendant's county of residence is a venue basis only where the plaintiff was first injured outside Missouri, under RSMo 508.010.5(2). The small claims division handles money disputes up to $5,000, but defamation usually needs a regular civil filing. The elements you must prove (a false statement of fact, communicated to a third party, that harmed your reputation, with the required degree of fault) and the defenses (truth, opinion, and privilege) follow the same national rules covered in our main guide.

• Statute of limitations: 2 years (RSMo 516.140)
• Where to file: Circuit court for the county where the defamation was first published (RSMo 508.010.4 and 508.010.8); the defendant's county of residence applies only if the plaintiff was first injured outside Missouri. Small claims division handles money disputes up to $5,000
• Damages: No statutory cap on compensatory damages; punitive damages are capped under RSMo 510.265 at the greater of $500,000 or five times the net judgment
• Anti-SLAPP: Broadened on August 28, 2026. RSMo 537.528, which reached only speech connected with a public hearing or quasi-judicial proceeding, was repealed that day and replaced by RSMo 537.529, the Uniform Public Expression Protection Act, which covers communications in or about governmental proceedings and the exercise of speech, press, assembly, petition and association rights on a matter of public concern, with a 60-day motion deadline, an automatic stay of proceedings, dismissal with prejudice, an appeal of right, and fees to a prevailing movant.

Is defamation a crime in Missouri? No. Missouri has no general criminal-defamation statute in force, so defamation is pursued as a civil claim only.

For the full step-by-step, see How to Sue for Defamation of Character.

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